Amplification in MCF7. (a) The x-axis shows the markers in a genomic order, with each chromosome uniquely colored. The y-axis depicts the measured copy number for each marker in log2 (the log scale is used given the high dynamic range). The arrow depicts the position of the locus that was also analyzed by real time PCR. (b) Focused view around the amplification site that was checked with real time PCR. As can be seen, there are several sites of amplifications of different levels. The black bar identifies the region for which average copy number was calculated.